More information about ThunderScan is available at URL:
http://www.defensecode.com

2. Software Overview
====================
According to the plugin developers, Gwolle Guestbook is is not just
another guestbook for WordPress. The goal is to provide an easy and
slim way to integrate a guestbook into your WordPress powered site.

The Cross-Site Scripting vulnerability can enable the attacker to
construct the URL that contains malicious JavaScript code. If the
administrator of the site makes a request to such an URL, the
attacker's code will be executed, with unrestricted access to the
WordPress site in question. The attacker can entice the administrator
to visit the URL in various ways, including sending the URL by email,
posting it as a part of the comment on the vulnerable site or another
forum.

To confirm the vulnerability make sure dashboard widget is added and
that there is at least one unchecked entry in the guestbook. The
vulnerability was tested using Apache web server.

DefenseCode WebScanner is a DAST (Dynamic Application Security
Testing, BlackBox Testing) solution for comprehensive security audits
of active web applications. WebScanner will test a website's security
by carrying out a large number of attacks using the most advanced
techniques, just as a real attacker would.